Disk attachment.



DISK ATTACHMENT.

APPLICATION rum) 11017.3,1911.

T. BRENNAN;

Patented May 5, 1914.

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UNITED STATES PATENT OFFICE.

THOMAS BRENNAN, JR., OF MINNEAPOLIS, MINNESOTA, ASSIGNOB TO MONITOR DRILL COMPANY, OF MINNEAPOLIS, MINNESOTA, A CORPORATION OF MINNESOTA.

DISK ATTACHMENT.

T 0 all whom it may concern Be it known that I, THOMAS BRENNAN, J r.. a citizen of the United States, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Disk Attachments, of which the following is a specification.

This invention relates particularly to double disk attachments, in which the disks are so supported that they will adjust themselves with respect to each other in service, and as they wear in diameter by a bodily movement toward and away from each other.

The invention relates more especially to a disk attachment in which the aforementioned adjustment is obtained by moving the disks bodily with respect to each other while the angle between them remains constant. By this means an attachment is produced which will operate properly in service, regardless of irregularities in the contour of the disks and regardless of their exact diameter. By this means an attachment is produced which will operate satisfactorily with crooked or unstraightened disks, because even such disks will act in the proper manner. Thus the cost of the straightening operation may be saved.

It has been found that where the adjustment between the disks is secured by changing the angle between them, the character of the furrow also changes with the angle, and that the force necessary to drag the disks through the ground increases with the increase of angle. This invention, therefore, has for one of its objects to produce a disk attachment which shall not be subject to the aforementioned objection.

Another object of the invention is to provide a double disk attachment of such char acter and construction that as the disks wear in diameter they will maintain substantially their original point of contact, thereby insuring that the operation of the attachment and the character of the furrow openedwill be substantially the same with worn disks as with new ones.

A further object of the invention is to provide a disk attachment in which the disks are so supported that they will maintain their proper point of contact with a minimum of pressure between the disks. It will be understood that any excess of pressure between the disks greatly increases the fric- Patented May 5, 1914.

Serial No. 658,413.

tion of the disks, so that a greatly increased draft is necessary to draw them through the ground and so that an excessive wear results. For this reason it is desired to produce a support whereby the disks may be maintained in proper relation to each other with a minimum of pressure between them.

Still another object of the invention is to produce a novel form of disk support, whether the same be used for supporting the disks of single or double disk attachments. It is intended to so form the bearing that a considerable portion of the expense of manufacture may be eliminated, but so that a proper fit may be nevertheless obtained, and to provide a support for the disks of such construction that the wear will be taken up on elements or parts which can be most easily replaced and can be most cheaply manufactured. By this means an attachment of such construction is produced that replacement for repair, etc., can be effected at a minimum expense and with a minimum of trouble.

Other objects and uses will appear from a detailed description of the invention, which consists in the features of construction and combination of parts hereinafter described and claimed.

In the drawing, Figure 1 shows a side elevation of a double disk attachment, embodying the features of my invention and having the near disk removed; Fig. 2 shows a horizontal section, taken on line 22 of Fig. 1, looking in the direction ofthe arrows; and Fig. 3 shows a side elevation of the bearing construction, the hub being removed.

In the drawing, the boo-t of the attachment is designated by thenumeral a. A standard 5 carries the disks 6 and 7 at its lower end. For this purpose, axles 8 and 9 are provided, each of which has a non-circular shouldered portion 10 on its inner end, which portions seat within a non-circular transverse hole 11 in the standard.

- A bolt 12, which is extended through the axles and through the hole, draws the axles securely to each other and thus retains them rigid with respect to the standard and with respect to each other. A sleeve 13 is slidably mounted on each axle, but is preferably of such a, character that it cannot rotate on the same. To prevent rotation, the axles S are non-circular in form, the sleeves being of similar contour. In the construction illustrated, the axles are octagonal and fit loosely within the holes 14 of the sleeves.

The outer end of each axle is provided with a flange 15. A spring 16 may be interposed between each flange and the corresponding sleeve, so that a pressure will be exerted on the sleeves, tending to force them toward each other. A collar 17 is secured to each disk, the same being rotatablymounted on the corresponding sleeve of a size and form to contact the flange 15. Each disk is provided with a hole of suitable size to clear the standard, but of such size that the portion 18 of the disk contacts the inner face of the corresponding sleeve. By this construc-- tion the disk and collar serve to engage the sleeve between them in such manner that the spring pressure on the sleeve tends to force the disk inward but in such manner that the disk and collar may rotate freely.

By reason of the angle between the axles 8 and 9, the edges of the disks will be brought together at the point 19. As the disks wear in diameter they will move bodily toward each other, the point of contact drawing inwardly toward the standard, but each disk remaining substantially parallel to its previous positions, as is well indicated by the dotted lines in Fig. 2. At the same time the point of contact between the disks will re main at practically the same angle with respect to the standard and other portions of the boot. Now the axles 8 and 9 are so set as to normally bring the disks together at the point 19 of Fig. 1. When the disks are placed in the ground and a draft is thrown on them, the resulting stresses will tend to move this point of contact lower down into the furrow. This would be an undesirable result, but the construction herein disclosed is peculiarly adapted to meet and resist these stresses. It is seen that any downward movement of the point of contact would of necessity change the angle between the disks and their axles. The force necessary to produce such a change is well resisted in the present construction, because the collars l7 engage the flanges 15 so that a force is produced between each flange and the corresponding sleeve. The amount of such force will depend upon the length of the axle, but it is not necessary to make the axle unusually long in order to sufliciently withstand such stresses.

While I have herein shown and described only one form of construction for permitting the disks to move bodily toward each other, still I do not limit myself to the particular construction illustrated, but contemplate within the scope of my invention any construction in which the compensating adjustment between the disks is accomplished by bodily movement of the disks toward each other.

weaves By reason of the manner in which the disks adjust themselves with respect to each other, the will remain in contact at the proper point, regardless of inequalities or unevenness in contour. By reason of this fact, bent or crooked disks can be used, so that the cost of straightening can be saved. The cost of such straightening operation is considerable, and therefore the present form of disk attachment can be manufactured at considerable reduction in cost as compared with the construction in which the disks must be straightened.

While I have shown in the drawing and described herein features of my invention as used in double disk attachments, still it will be evident that other features of the invention may be used with equal satisfaction and with equal advantage in single disk constructions. For this reason I do not limit myself to the construction herein shown and described.

I claim:

1. In a disk attachment, the combination of a boot, a pair of axles secured to the same and placed at an angle to each other, a sleeve slidably mounted on each axle, and a disk rotatably mounted on each sleeve, substantially as described.

2. In a disk attachment, the combination of a boot, a pair of axles secured to the same and placed at an angle with respect to each other, a sleeve slidably mounted on each axle and of a formation to be retained against rotation thereon, and a disk carried by each sleeve and rotatable with respect thereto, substantially as described.

3. In a disk attachment, the combination of a boot, a pair of axles on the same and placed at an angle to each other, a flanged sleeve slidably mounted on each axle, a collar rotatably carried by each sleeve, and a disk secured to each collar and overlying the inner face of the flange of the corresponding sleeve, substantially as described.

4-. In a disk attachment, the combination of a boot, a pair of flanged axles secured to the same and placed at an angle to each other, a flanged sleeve slidably mounted on each axle, a spring interposed between each axle flange and the corresponding sleeve, a collar rotatably mounted on each sleeve, and a disk secured to each collar and overlying the inner face of the flange of the corresponding sleeve, substantially as described.

5. In a disk attachment, the combination of a boot, a pair of flanged axles carried by the same and placed at an angle to each other, a flanged sleeve slidably mounted on each axle, a collar rotatably mounted on each sleeve and contacting the flange of the corresponding axle, a spring interposed between each axle flange and the corresponding sleeve, and a disk secured to each collar and overlying the inner face of the flange of the corresponding sleeve, substantially as described.

6. In a disk attachment, the combination of a supporting member, a pair of axle members carried thereby and extending at an angle to each other, a flange contacting portion on the end of each axle member, a collar surrounding each axle member and having its end portion engaging the corresponding flange contacting portion, a sleeve interposed between the inner end of each collar and the corresponding axle, a perforated disk surrounding each axle and secured to the corresponding collar and overlying the inner face of the corresponding sleeve, and 15 Louis W. FULLER, ELEANOR B. MOSELEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

